This circuit was found in a Texas Instruments documentation from the 1980s. The circuit monitors engine temperature by warning of engine warm-up and warning when the fan is on.
This circuit causes an incandescent lamp to flash according to the input audio signal. The SCR...
This doorbell or buzzer as announced in a 1990s US publication uses an operational amplifier that admits...
This circuit, using a unijunction transistor (UJT), converts a voltage applied to the input in a...